TWI680751B - Disposable diapers - Google Patents

Abstract

An object of the present invention is to provide a disposable diaper having a downwardly openable pocket for containing and holding excreta moving toward the waist opening side in the back waist region.

The disposable diaper (10) has a pocket forming portion (20) at the rear waist region (14), and the pocket forming portion is provided with a pocket (30) that can open downward in the front-back direction. The pocket forming portion (20) has: two side fixing portions (45) fixed to the band-shaped domain (23); and a portion extending from the portion connected to the band domain (23) upwards between the two side fixing portions (45) The pocket inner domain (42); and the pocket outer domain (43), which extend toward the crotch domain (15) in the front-back direction via the bending portion (33) extending in the lateral direction X and the pocket inner domain (42) Located on the extension of the absorber (85). A pocket elastic body (49) extending in the lateral direction X is arranged in the pocket inner domain (42), and the pocket outer domain (43) has a position extending on the extension line of both side edges (85c) of the absorber (85) The portion of the aforementioned lateral X is bent.

Description

Disposable diapers

The invention relates to a disposable diaper.

Conventionally, disposable diapers equipped with pockets for containing and holding excreta are well known. For example, Patent Document 1 discloses a disposable diaper having: a liquid absorption structure centered on the crotch area; and a stretchable sheet, which is located on the skin-facing surface in the front and rear waist areas Side, and traverse the front and rear ends of the liquid absorption structure with the front and rear ends of the liquid absorption structure covered, and a pocket for storing excrement is defined between the stretchable sheet and the front and rear ends of the liquid absorption structure .

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-252303

Disposable paper of the invention disclosed in Patent Document 1 The diaper can contain and keep the excrement moving toward the front and back waist regions by defining pockets in the front and back waist regions.

However, in the wearing state of the diaper, the stretchable sheet is stretched in conjunction with the extension of the front and rear waist regions in the waist direction, so the stretchable sheet is attached to the wearer in close contact with the front and rear ends of the liquid absorbing structure body of. As a result, the opening of the pocket demarcated between the stretchable sheet and the front and rear ends becomes closed, and excreta cannot move into the pocket and may move on the stretchable sheet and stain the back of the wearer. concern. In addition, for example, even if the storage pocket is formed, the shape of the pocket is deformed by the body pressure due to the infant's repeated lying on the back and lying on its side, and the opening to the extent that the excrement cannot be stored cannot be formed, and there is a concern that the original shape cannot be returned.

The object of the present invention is to improve conventional diapers, and to provide a disposable diaper having a downwardly openable pocket for containing and holding excreta moving toward the waist opening side in the back waist region.

In order to solve the aforementioned problems, the present invention relates to a disposable diaper, which has an up-down direction, a horizontal direction, and a front-back direction intersecting the same when worn, and includes: a skin contact surface and its opposite side The non-skin contact surface, the front waist region, the back waist region, the crotch region between the front and back waist regions, and the absorbent body extending from the crotch region to the front and back waist regions.

In the disposable diaper of the present invention, the rear waist region has a band-shaped region, which is located on the skin contact surface side and extends toward the lateral direction Stretch; and a pocket forming portion, which is located on the side of the non-skin-contacting surface, and is provided with a pocket that can be opened downward in the front-back direction opposite to the band-shaped domain in the central portion in the lateral direction, the pocket forming portion It includes: two side fixing portions fixed to the band-shaped domain; a pocket inner domain extending upward from a portion connected to the band-shaped domain between the two side fixed portions; and a pocket outer domain extending laterally through the The bending portion is opposed to the inside pocket area in the front-rear direction and extends toward the crotch area, and is located on the extension line of the absorber. A pocket elastic body extending toward the lateral direction is disposed in the inside pocket area. The outer region of the pocket is a portion that is bent in the lateral direction and has a position on an extension line of both side edges of the absorbent body.

The disposable diaper of the present invention is provided with a pocket forming portion having a pocket that can be opened downwards in the back waist region. In the wearing state, even if the waist pocket opening is extended, it will not be closed. The excretion moving from the opening of the back waist flows into the pocket to prevent leakage to the outside, and can avoid the discomfort and skin problems caused by the excrement touching the skin.

10‧‧‧Disposable diapers

13‧‧‧ Front waist

14‧‧‧ Rear waist

14b‧‧‧The opening edge of the back waist

15‧‧‧Crotch domain

23‧‧‧banded domain of the back waist

30‧‧‧ Pocket

32‧‧‧ Pockets on both sides

33‧‧‧Bending Department

41‧‧‧The central part of the band

41a‧‧‧Inner end of the band

42‧‧‧Pocket inner domain

43‧‧‧Outside pocket

49‧‧‧Pocket elastomer

58‧‧‧ Rear auxiliary sheet

80‧‧‧Induction groove

85‧‧‧Absorber

85a‧‧‧The side edge of the absorber

94‧‧‧Liquid impermeable sheet

X‧‧‧horizontal

Y‧‧‧Vertical

[Fig. 1] is a rear view of the disposable diaper of the present invention.

[Fig. 2] A view of the back waist region in the non-wearing state of the diaper seen from above.

[Fig. 3] A perspective view of the back waist region in the wearing state of the diaper.

[Fig. 4] Fig. 4 is a partly broken development view of the diaper in a state where each elastic body is stretched in the longitudinal direction and the lateral direction of the diaper.

[Fig. 5] is an exploded perspective view of a diaper.

[Fig. 6] (a) shows an expanded plan view of the base sheet, and (b) and (c) show the folding stroke of the base sheet. (d) A diagram showing the bending state of the base sheet.

7 is a schematic cross-sectional view taken along the line VII-VII shown in FIG. 2.

[Fig. 8] is a schematic cross-sectional view taken along the line VIII-VIII shown in Fig. 1.

9 is a schematic cross-sectional view taken along the line IX-IX shown in FIG. 3.

10 is a cross-sectional view similar to FIG. 8 in Modification 1. FIG.

11 is a cross-sectional view similar to FIG. 8 in Modification 2. FIG.

12 is a cross-sectional view similar to FIG. 3 in Modification 3. FIG.

13 is a cross-sectional view similar to FIG. 8 in Modification 4. FIG.

The pull-on type (pants type) diaper 10 shown as an example of the disposable diaper of the present invention has: a longitudinal direction Y; a lateral direction X; and these orthogonal thickness directions (3D) Z; and wear Use the up and down directions in the state, and have: extend along the longitudinal direction Y, dividing its horizontal X dimension into 2 equal longitudinal axes P; and extend along the transverse direction X, dividing its longitudinal Y dimension into 2 equal transverse directions Axis Q. In addition, in this specification, "the diapers 10 overlap each other when viewed from above" means that they overlap each other in the thickness direction Z.

Referring to FIGS. 1 and 4, the diaper 10 includes: a skin-facing surface and a non-skin-facing surface facing this; a ring-shaped elastic waist sheet 11 extending in the waist direction; and being attached to the elastic waist sheet 11 The absorbent body 12; the front waist region 13; the back waist region 14; and the inferior crotch region 15 between the front and rear waist regions 13, 14. The diaper 10 is symmetrical with respect to the longitudinal axis P, and the elastic waist sheet body 11 is composed of a front waist sheet body 17 located in the front waist region 13 and a rear waist sheet body 18 located in the rear waist region 14. The absorption body 12 is provided with an absorption body 85 having both side edges 85c extending in the longitudinal direction Y.

The front and rear waist regions 13 and 14 have inner end edges 13a and 14a respectively extending toward the transverse direction X; and the outer end edges extending toward the transverse direction X are separated from the inner end edges 13a and 14a in the longitudinal direction Y (front and rear waist opening edges ) 13b, 14b; and a horizontally long rectangular shape defined by the two side edges 13c, 14c extending toward the longitudinal direction Y between the inner and outer end edges 13a, 13b, 14a, 14b. Each of the side edges 13c of the front waist region 13 and the side edges 14c of the rear waist region 14 overlap each other, and are connected by side seams 19 intermittently arranged in the longitudinal direction Y to form the diaper 10 The edges of both sides are delineated into a waist opening 21 and a pair of leg openings. The side seam 19 is performed by a well-known joining method, for example, by various well-known thermal welding methods such as hot embossing/recessing processing, ultrasonic processing, and the like.

<pocket>

Referring to FIGS. 1 to 3, and 8, the diaper 10 has a belt-shaped region 23 extending laterally X on the side of the skin contact surface on the waist opening side of the rear waist region 14; and a pocket forming portion 20, which Is the horizontal X in the back waist region 14 The central portion of is provided with a pocket 30 facing the belt-shaped domain 23 in the front-rear direction in the wearing state. The belt-shaped domain 23 has a central portion 41 facing the pocket 30 in the front-rear direction and located at the lateral central portion of the rear waist region 14. The pocket forming portion 20 has: both side fixing portions 45 fixed to the band-shaped region 23; a pocket inner region 42 extending upward from a portion connected to the central portion 41 of the band-shaped region 23 between the two side fixing portions 45; The outer region 43, which extends toward the crotch region 15 side in the front-rear direction via the bent portion 33 extending in the lateral direction X and the pocket inner region 42; and a pocket formed by both sides of the inner and outer regions 42, 43 of the pocket 32 on both sides. The central portion 41 of the band-shaped domain 23 has inner and outer end portions (upper and lower end portions) 41a and 41b, and the pocket inner domain 42 is connected to the inner end portion (lower end portion) 41a of the central portion 41 via a bent portion 31.

As described above, the pocket side regions 32 are formed by overlapping the inner and outer side regions 42 and 43 of the pocket, and the two side fixing portions 45 formed outside the pocket side regions 32 are fixed to the belt-shaped region 23 Both sides. The fixed portions 45 on both sides extend from the side seam 19 to the inner side in the lateral direction X. Therefore, the pocket 30 is at least about the size of the opening at the center of the back waist region 14 and is not the entire area between the side seams 19 Those with openings. The belt-shaped domain 23 and the pocket 30 are located on the waist opening side of the back waist domain 14. Here, "the waist opening side of the back waist region 14" refers to a region located on the side of the outer end edge 14b more than a line that bisects the longitudinal dimension of the back waist region 14 in two.

The band-shaped domain 23 is given elasticity at least in the transverse direction X by a linear or strip-shaped rear upper waist elastic body 64 described later. In addition, a linear or strip-shaped pocket elastic body 49 extending in the lateral direction X is arranged in the pocket inner region 42. In this embodiment, the pocket elastic body 49 is between the fixed portions 45 on both sides Extend to the horizontal X.

2 and 3, in the wearing state and the natural state of the diaper 10 of the present embodiment, the inner region 42 of the pocket shrinks in the transverse direction X to form a plurality of folds 78, so that the transverse direction X of the inner region 42 of the pocket Is smaller than the lateral X dimension of the pocket outer domain 43. In addition, the outer region 43 of the pocket is located to extend the existing region of the absorber 85 of the inferior crotch region 15 to the side of the band region 23, and the both-side region 32 of the pocket extends the both side edges 85c of the absorber 85 The portion to the side of the band-shaped domain 23 is bent inward. The pocket side regions 32 are the difference between the lateral X dimension of the pocket inner domain 42 and the lateral X dimension of the pocket outer domain 43 due to the contraction of the pocket elastomer 49 and the absorber 85 of the pocket lateral domain 32 The inward bending of the extended portions of the both side edges 85c forms a state in which it can be folded so as to extend toward the inner side in the lateral direction X (toward the longitudinal axis P).

In this way, by forming a state in which both side regions 32 of the pocket are stretchably folded in, in a state where the bending portion 31 and the two side regions 32 of the pocket are slightly unfolded, respectively, in a plan view of the diaper 10, in the band region A recess 25 (see FIG. 2) opening upward is defined between 23 and the pocket 30. Moreover, the pocket 30 has: the bending part 31 bent toward the horizontal axis Q (downward direction); the pocket side regions 32 bent toward the inner side of the lateral direction X; and the waist opening 21 (upward direction) ) The bent portion 33 is bent in different directions (3 directions) by each other, and when the belt-shaped domain 23 is extended toward the waist circumference, the pocket-side domains 32 stand up, and the pocket inner domain 42 A three-dimensional pocket space S for accommodating and holding feces is formed inside the pocket 30 while extending obliquely rearward with respect to the band-shaped domain 23. The center of the pocket inner field 42 connection The inner end portion 41a of the portion 41 is positioned outside the longitudinal direction Y from the central portion of the rear waist region 14 in the longitudinal direction Y. In addition, in order to form the folds of both side regions 32 of the pocket more stably, a fold line extending in the longitudinal direction Y may be formed on the extension lines of both side edges of the absorber 85 by pressing and/or heating.

Referring to FIGS. 8 and 9, the pocket inner area 42 is inclined relative to the central portion 41 and is located here, and as this moves backward, the inclination angle α with respect to the central portion 41 becomes larger. Therefore, as the inclination angle α becomes larger, the inside area 42 of the pocket becomes in a collapsed state and functions as the top surface of the pocket 30, and the pocket 30 presents a pocket space capable of accommodating and holding a relatively large amount of excrement inside it ( Storage space) S box shape.

<Elastic Waist Sheet>

4 and 5, the front waist sheet 17 has a front waist sheet 50 that defines the outer shape of the front waist region 13. The front waist sheet 50 has a body portion 52 on which the front end portion 12A of the absorption body 12 is arranged, and an extension portion 53 located outside the longitudinal direction Y of the body portion. The extended portion 53 is bent along the bending line 54 extending in the lateral direction X toward the inner side in the longitudinal direction Y and fixed to the front end portion 12A of the main body portion 52 and the absorption body 12. Between the main body portion 52 and the extension portion 53 of the front waist sheet 50, a plurality of linear or strip-shaped front waist elastics 55 extending in the lateral direction X are installed in a stretchable state so as to be contractible.

The front auxiliary sheet 51 that is expandable and contractable in the lateral direction X is arranged at a portion of the lower waist region 15 side of the front waist elastic body 55 of the front waist sheet 50. The front auxiliary sheet 51 is located on the side opposite to the skin and is fixed A part of the front end portion 12A and the main body portions 52 on both sides thereof cover the front end portion 12A of the absorption main body 12. The front auxiliary sheet 51 is formed of a non-woven fabric of elastomer fibers. The front auxiliary sheet 51 is formed of a stretchable fiber nonwoven fabric, so this has a better skin feel than a non-stretchable fiber nonwoven fabric and is superior in wearing.

The back waist sheet body 18 has a rear waist sheet 60 composed of an inner sheet 61 on the side facing the skin and an outer sheet 62 on the side not facing the skin; and a plurality of strips extending in the lateral direction X A linear or strip-shaped lower back waist elastic body 63 is fixed between the inner and outer sheets 61 and 62 in a stretchable state so as to be contractible. The back waist region 14 has a base sheet 70 fixed to the outer end of the back waist sheet body 18 in a state of being bent into a zigzag cross section.

<basic sheet>

Referring to FIGS. 5 and 6(a), the base sheet 70 is formed by: the inner end edge 70a and the outer end edge (back waist opening edge 14b) extending in the lateral direction X, and between the inner and outer end edges 14b, 70a A horizontally long rectangular shape defined by the two side edges 70c extending in the longitudinal direction Y, and having a first surface 80A (skin-facing surface) and a second surface 80B (non-skin-facing surface) located on the opposite side; The first bending line 71 and the second bending line 72 extending in parallel in X. The base sheet 70 has an outer end 73 between the outer end edge 14b and the first bending line 71; an intermediate portion 74 between the first bending line 71 and the second bending line 72; 2. The inner end 75 between the bending line 72 and the inner end edge 70a. On the second surface 80B side of the outer end portion 73, a pair facing each other in the horizontal direction X The first junction domain 81A is located here, and the first non-junction domain 81B is located here. On the first surface 80A side of the intermediate portion 74, a pair of second bonding domains 82A opposed to each other in the lateral direction X are located here, and the second non-bonding domain 82B is located here between the two.

The base sheet 70 further includes: an inner sheet 76 on the side facing the skin; an outer sheet 77 on the side not facing the skin; and an outer sheet 73, 77 extending between the inner and outer sheets 76 and 77 at the outer end 73 extending laterally X A plurality of linear or strip-shaped upper and lower back waist elastics 64 that are retractably fixed in the stretched state; and between the inner and outer sheets 76, 77 that extend in the lateral direction X at the middle portion 74 and are shrinkably fixed in the stretched state A plurality of linear or strip-shaped pocket elastics 49.

6(b) and (c), the base sheet 70 is bent along the first bending line 71 at the second surface 80B side of the outer end portion 73 and the second surface 80B side of the intermediate portion 74 is bent , And by bending along the second bending line 72 with the first surface 82A side of the intermediate portion 74 and the first surface 80A side of the inner end portion 75 in contact with each other, it can be maintained in the longitudinal section to be bent substantially Z-shaped state.

The first junction domain 81A and the second junction domain 82A are such that the dimensions of the lateral X are almost equal, and the dimensions of the lateral X of the first and second non-junction domains 81B, 82B located between these are also almost equal In the plan view of the diaper 10, the first and second non-bonding regions 81B and 82B overlap each other. The first and second bonding domains 81A and 82A are formed by, for example, applying a well-known adhesive such as a hot-melt adhesive or heat-sealing means such as heat sealing.

Referring to FIG. 6(d), the base sheet 70 has the outer end 73 contracted by the rear upper waist elastic body 64, and is bent along the first and second bending lines 71, 72 to pass the first and second The state where the second bonding regions 81A and 82A are bonded is further improved by a pair of third bending lines 79A and fourth bending lines (mountain bending lines) 79B extending in the longitudinal direction Y along the side edges of the second non-bonding region 82B The laminated middle portion 74 and the inner end portion 75 are bent so that the portion other than the outer end portion 73 has a slightly Ω-shaped cross section. The horizontal X dimension of the base sheet 70 in such a folded state is almost the same as the horizontal X dimension of the rear waist region 14 in the natural state (the state where each elastic body is not stretched).

Referring to FIGS. 4 and 7 to 9, the base sheet 70 bent into a slightly Ω-shaped cross section is fixed to the absorbent body 12 and the rear through a bonding region (third bonding region) 83 having a concave shape toward the horizontal axis Q.腰片体18。 Waist sheet body 18. In this way, the base sheet 70 is fixed in a folded state by a plurality of bending lines, by which the band-shaped domains 23 of the rear waist region 14 are formed by the outer end portions 73 respectively, and the second non-joint by the middle portion 74 The domain 82B forms the pocket inner domain 42, and the pocket outer domain 43 is formed by the portion of the inner end portion 75 facing the second non-joint domain 82B. In addition, both side portions of the inside pocket 42 and both sides of the outside pocket 43 are joined in a state of being overlapped with each other via the second joining domain 82A.

In this embodiment, the pocket 30 and the like are formed by fixing the base sheet 70 made of different bodies to the back waist sheet 60, but as long as the technical effect of the present invention is achieved, the back waist sheet 60 and the base sheet may be formed by an integrated sheet 70, the same sheet member as the back waist sheet 60 can also be used The belt-shaped domain 23 is formed, and a sheet member of a different body is fixed to the belt-shaped domain 23 to form a pocket 30. In addition, the base sheet 70 may be formed from one elastically stretchable fiber nonwoven fabric sheet, or the elastically stretchable fiber nonwoven fabric sheet may be disposed between the inner and outer sheet 76, 77 instead of the rear upper waist elastic body 64. Therefore, in this specification, for example, "the pocket inner domain 42 is connected to the inner end 41a of the central portion 41 of the belt-shaped domain 23" means that the central portion 41 and the pocket inner domain 42 are formed by the same sheet member, and The case where the bent portion 31 is bent; and the case where these are formed by sheet members of different bodies, and the two sheet members are connected at the bent portion 31. In addition, the sheet member forming the absorption body 12 may be extended to the rear, and after bending, the waist sheet and the part extending further to the rear than this may form a pocket.

<absorption body>

The absorption body 12 has a rectangular shape, and has a front end portion 12A, a rear end portion 12B, and an intermediate portion 12C located between the front and rear end portions 12A, 12B. The absorption body 12 includes: a body side wrap 84 made of a non-woven fabric with liquid permeability on the side opposite to the skin; a liquid-absorbent absorber 85; and the entire bottom surface of the covered absorber 85 A leak-proof sheet 86 formed of a liquid-impermeable plastic film; and a liquid-impermeable or liquid-impermeable covering sheet 87 that forms the entire non-skin-facing surface of the absorption body 12.

The absorber 85 is composed of a core material formed of a mixture of fluff pulp and absorbent polymer particles, and a liquid-diffusible core-clad layer sheet formed of tissue paper or the like that surrounds the entire core material. The absorber 85 extends from the front and rear edges extending in the lateral direction X, and extends in the longitudinal direction Y between the front and rear edges The rectangular sides delimited by the extending side edges, that is, have concave induction grooves 80 extending from the inferior crotch region 15 toward the posterior waist region 14. In the induction groove 80, the liquid-absorbent core of the absorber 85 has a smaller mass than the non-existent or other parts, that is, a notch or bottomed groove. In the present embodiment, the induction groove 80 is a bottomed groove having a thickness smaller than that of its part. In addition, although there is one induction groove 80, a plurality of induction grooves 80 may be formed.

The covering sheet 87 has both side portions located outside of the lateral edges X of both side edges of the leakage preventing sheet 86. Both side portions are adjacent to both side edges of the leak-proof sheet 86, and are bent inward (toward the absorber 85 side) along a bending line extending in the longitudinal direction Y and fixed to the body-side wrap 84. Both side portions have: two end fixing portions fixed to the body side wrap 84 separated from each other in the longitudinal direction Y; a proximal edge portion fixed to both side edges of the body side wrap 84; and between the two end fixing portions A distal edge portion (free edge portion) 88 extending toward the longitudinal direction Y and extending parallel to the proximal edge portion toward the longitudinal direction Y. The distal edge portion 88 is formed in a sleeve shape formed by bending and fixing the outer edge portion of the covering sheet 87, and at this edge portion, a plurality of linear or strip-shaped side edges extending in the longitudinal direction Y are elastic The body 89 is arranged to be retractable in an extended state. The edge portion is contracted by the side elastic body 89 to separate from the body side wrap 84 toward the wearer's body side to form a blocking side, and is fitted to the wearer's thigh to prevent leakage of excrement. In addition, on both sides of the covering sheet 87, a plurality of linear or strip-shaped leg elastics 90 extending in the longitudinal direction Y are fixed so as to be contractible in an extended state.

The leg elastic body 90 is formed by a plurality of elastic materials arranged in a size required for separation in the lateral direction X, and is formed due to a certain width Since the elastic band has elasticity, it fits on the wearer's leg circumference in a planar state to effectively prevent side leakage of excrement. In addition, the rear end portion of the leg elastic body 90 overlaps the rear waist region 14 and the rear lower waist elastic body 63 in a plan view. The leg elastic region by the contraction force of the leg elastic body 90 and the waist elastic region by the contraction force of the lower back waist elastic body 63 overlap in a plan view, and a virtual elasticity can be formed around the wearer's thigh band.

Referring to FIG. 4, the fixing portions 45 on both sides of the inner and outer regions 42 and 43 of the pocket are fixed to the band-shaped region 23 and the rear end portion 12B of the absorption body 12 via a joining region 83 having a concave shape toward the horizontal axis Q, and The portion between the distal edges 88 of the covering sheet 87 is not fixed to the rear end 12B of the absorption body 12. Since the base sheet 70 has such a bonded state, a rear space R for accommodating and holding excrement moving to the rear waist region 14 is defined between the non-bonded region and the rear end portion 12B of the absorption body 12.

In general, infants and young children of relatively low months of age excrete fluid loose stools during breastfeeding, postures held by the mother, etc., so soft stools leak out from the opening of the lower back or are squeezed Worries about the back of the wearer. In addition, during the wearing of the diaper 10, the front waist region 13 may form a space between the body and the body when the waist opening slides down. However, since the rear waist region 14 has a shape that protrudes the hips, It is not easy to form such a gap, and in order to temporarily store and hold excrement, it is the diaper 10 of the present embodiment, and it is necessary to intentionally form a pocket space S that has a three-dimensional shape when worn.

In order to solve such problems in the past diapers, although There is a structure for storing excreta in a storage space extending downward or rearward in the front and rear waist regions and/or inferior crotch regions. However, as in this embodiment, the back of the rear waist region is provided with an opening downward (toward the horizontal axis Q) and The diaper 10 of the pocket 30 extending upward is not conventional.

In this embodiment, since the belt-shaped domain 23 and the pocket 30 are located on the waist opening side of the back waist region 14, and the belt-shaped domain 23 is fitted to the body of the wearer by the elongation stress of the upper back waist elastic body 64, Therefore, it is possible to prevent the leakage of excrement moving from the hip region 15 side to the waist opening side, and the excretion whose movement is prevented from flowing into the pocket space S extending upward in a convex shape to be temporarily accommodated and held. In this way, by allowing excrement that has been prevented from moving into the pocket 30 located on the back side of the back waist region 14, discomfort and skin problems caused by the excrement coming into contact with the body can be suppressed. Since the pocket 30 is not linked to the expansion and contraction of the band-shaped domain 23, even if the waist domain 14 is extended, there is no possibility that the pocket opening is closed. In addition, since the pocket 30 is positioned above the upper end (rear end) of the absorber 85, it can accommodate body fluid that cannot be absorbed by the absorber 85 and moves to the opening side of the back waist.

In addition, a part of the base sheet 70 forming the pocket 30 is joined to the back waist region 14 via the joint region 83 extending from the side seam 19 to the inside in the lateral direction X. The base sheet 70 itself is more elastic than the leg elastic body 90 and the side elastic body 89 It is positioned outside the longitudinal direction Y, and does not overlap with the equivalent diaper 10 in plan view. Therefore, the contraction force of the leg elastic body 90 and the side elastic body 89 acts indirectly on the outer region 43 of the pocket, and there is no reason to pull the outer region 43 of the pocket downward when the force to pull this downward is applied There is a concern that the bent portion 33 collapses and the pocket space S is eliminated.

Furthermore, referring to FIGS. 2, 3, and 7, in the non-wearing state of the diaper 10, except for having both side regions 32 of the pocket that fold the pocket 30 inward (in the unfolded state, toward the longitudinal axis P side) In addition to the appearance, in the wearing state, the pocket side domains 32 stand up to move the pocket inner domain 42 in a direction F separated from the central portion 41 of the belt-shaped domain 23, so that the inclination angle α from the central portion 41 becomes larger and Form pocket space S. On the other hand, in the non-wearing state of the diaper 10, since the area 32 on both sides of the pocket is folded, the central portion 41 of the belt-shaped area 23 and the inside area 42 of the pocket are in contact with each other, so the back waist The domain 14 as a whole becomes tighter, and the size in the thickness direction Z becomes smaller than the wearing state, so the storage properties of the plurality of diapers 10 and the convenience during transportation are excellent.

Moreover, even if the wearer is in a supine state, when the body pressure of the wearer is applied to the pocket 30, the area 32 on both sides of the pocket is bent, and the central portion 41 of the belt-shaped area 23 and the inner area of the pocket 42 is in a state of being in contact with each other, so that the base sheet 70 is not distorted and deformed due to body pressure, and there is no concern for the wearer about the foreign body sensation caused by the change in the thickness of the part of the back waist region 14. The pocket domains 32 can be separated from the body of the wearer, that is, they can be flexed and extended in the thickness direction Z. Therefore, when the body pressure is opened, the pocket domains 32 face the direction of separation from the body F (refer to FIG. 9) stands up, and a three-dimensional pocket space S is formed again.

Therefore, the wearer becomes supine or is held by the mother with the back pressed. Even when the pocket 30 repeatedly presses this force to the side of the body, the flexion and extension of the domains 32 on both sides of the pocket can The pocket 30 stably and repeatedly assumes a three-dimensional shape, so even if Even when the posture changes frequently or the infants and young children of a low age who frequently defecate and defecate repeatedly are put on the wearer, the defecate can be reliably accommodated in the pocket space S. Moreover, in this embodiment, as already described, since the pocket inner domain 42 has the required longitudinal Y dimension, the pocket lateral domains 32 stand up and move obliquely relative to the central portion 41 and move rearward, thereby functioning as The function of the top surface of the pocket 30 can contain more excrement than the configuration without the bending structure of the top surface and the side 32 of the pocket on both sides.

In the wearing state of the diaper 10, when the belt-like domain 23 is extended in the lateral direction X (waist direction), the bending of the pocket-side domains 32 is released and the pocket inner domain 42 moves toward the belt-like domain 23 to make the pocket The elimination of the space S may cause damage to the three-dimensional shape. In this embodiment, by arranging a pocket elastic body 49 that can be extended in the lateral direction X in the inner region 42 of the pocket, when the central portion 41 is stretched and the force that collapses the domains 32 on both sides of the pocket is to be applied, due to the elasticity The body 49 maintains the standing state of both side regions 32 of the pocket and the state in which the inner region 42 of the pocket is separated from the belt-shaped region 23 without resisting its force without shrinking, so the pocket 30 can more stably take on a three-dimensional shape.

In addition, the shrinkage rate in the transverse direction X of the pocket inner domain 42 is preferably lower than the shrinkage rate in the transverse direction X of the belt-shaped domain 23. At this time, the amount of shrinkage in the transverse direction X of the central portion 41 of the band-shaped region 23 (the length dimension in the transverse direction X of the contracted portion) is greater than the amount of shrinkage in the transverse direction X of the pocket inner region 42 and the pocket outer region 43 And, even if the band-shaped domain 23 is stretched in the transverse direction X by a predetermined magnification from the natural state (when contracted), the domains 32 on both sides of the pocket will not fall completely, and the pocket 30 can maintain a three-dimensional shape.

<Measurement method of shrinkage in each area>

First, in the unfolded state of the diaper 10, the layer of the pocket outer domain 43 and the band domain 23 overlapping the pocket inner domain 42 in plan view is cut at a predetermined width (for example, vertical dimension 15 mm×width dimension 100 mm). The product area (the area framed by the thick frame K in FIG. 4) was used as a sample, and the size of each sample was measured by the following procedure. i) Hold one sample at one of the two opposite ends of the horizontal X, ii) Install a jig and a weight at the other end, so that each sample is perpendicular to the ground without distortion Hold. In such a state, the placement area of the elastic element (in the absence of the elastic element is at a predetermined position of the sheet) is marked with ink or the like at two laterally opposed positions, and the separation size between the marks is measured, and This is taken as the size (L1) of each sample during contraction. In addition, the weight of the weight can be adjusted as long as it does not extend the elastic elements arranged in each sample. In this measurement, a weight of about 5.0 g is used. iii) Next, after removing the jigs and weights from each sample and extending in the transverse direction X until there are no wrinkles on the surface due to the elastic element, the divided size of the two marks is measured as the size when extended (L2). The dimensions L1 and L2 measured by such a measurement method are applied to the formula of shrinkage ratio=((L2-L1)/L2)×100(%), and the shrinkage ratio (%) of each sample is calculated.

The inner end portion 41a of the central portion 41 connected to the inside region 42 of the pocket is located outside the longitudinal portion Y in the longitudinal direction Y of the rear waist region 14. Therefore, the central portion 41 can be attached to the body above the groin (groove seam) of the wearer's buttocks. Therefore, compared with the case of contacting the concave groin, the central portion 41 is The gap between them is not easy to produce Effectively suppress the leakage of excreta. In addition, although not shown, in order to temporarily store and hold urine in the front waist region 13 as well, a pocket that can be opened downward may be arranged in the same way as the rear waist region 14.

In the present embodiment, the rear upper waist elastic body 64 is arranged almost uniformly over the entire length of the band-shaped region 23 in the longitudinal direction Y. The contraction force of the rear upper waist elastic body 64 may be almost constant, or may be different from each other. For example, the contraction force of the rear upper waist elastic body 64 may be adjusted so that the contraction force of the lower end portion (inner end portion) 41a is higher than other portions except for the lower end portion. That is, by setting the contraction force of the rear upper waist elastic body 64 disposed at the lower end 41a to be higher than the rear upper waist elastic body 64 disposed at other than the lower end 41a, the opening of the pocket 30 can be opened The fit of the body in the vicinity is improved, allowing the excreta to flow into the pocket space S surely.

In addition, in the rear waist region 14, a concave induction groove 80 extending from the crotch region 15 toward the rear waist region 14 is formed in the absorber 85. Even if a force such as body pressure acts near the opening of the pocket 30 to make the deformation smaller and the opening becomes smaller, since the soft stool excreted on the absorber 85 can be induced to the pocket space S along the induction groove 80, the Excrement is stored and kept in the pocket space S. In order to easily induce excreta to the pocket space S, the induction groove 80 is the back waist from the position of the crotch domain 15 side more than the back waist elastics 63, 64 located between the side seams 19 of the back waist domain 14 The domain 14 is ideally extended, and does not necessarily extend to the rear edge of the absorber 85. Moreover, by making the absorber 85 thinner in the induction groove 80, the step difference between the lower end of the pocket forming portion 20 located above it becomes smaller, and it can be said that This is to make it easier for excreta to flow into the pocket space S.

<Modification 1>

FIG. 10 is an example of a modification of the diaper 10 of the present embodiment, and is a view similar to FIG. 8.

Referring to FIG. 10, on the skin-facing surface side of the band-shaped domain 23, a rear auxiliary sheet 58 having elasticity and elasticity is arranged. When the band-shaped domain 23 is attached to the body only by the contraction force of the linear or strip-shaped upper back waist elastic body 64, there is a possibility that a relatively large wrinkle which may cause body leakage may be formed, so By arranging the rear auxiliary sheet 58 on the skin-facing side of the band-shaped region 23, not only the skin feel is improved, but relatively small wrinkles peculiar to the elastic sheet are formed on the surface, so soft stools can be prevented from walking along the wrinkles from the waist The opening leaks to the outside.

In addition, the rear auxiliary sheet 58 may be formed of a sheet material that is relatively bulky with elasticity or inelasticity and has high cushioning properties. In this case, even if the contraction force of the rear upper waist elastic body 64 is set relatively high in order to improve the fit of the rear waist region 14, at least there will be no skin-facing surface located in the band-shaped region 23 The rear auxiliary sheet 58 on the side exerts a cushioning function and causes wrinkle marks on the body.

<Modification 2>

FIG. 11 is an example of a modification of the diaper 10 of the present embodiment, and is a view similar to FIG. 8.

Referring to FIG. 11, in this modification, the base sheet 70 forms a band-shaped domain 23, and the back waist sheet 60 forms the pocket inner and outer domains 42, 43. One end edge portion 60a of the back waist sheet 60 is joined to the base sheet 70 via the joining region 92 in a bent state. The bonding domain 92 is formed of, for example, a hot-melt adhesive applied to the opposing surfaces of the two sheets 60 and 70, and various well-known thermal fusion means. In this manner, the band-shaped domain 23 and the pocket inner and outer domains 42 and 43 may be formed by sheet members of different bodies, and the pocket inner domain 42 and the pocket outer domain 43 may be formed by sheet members of different bodies. The inner end portion 93 of the base sheet 70 extends inwardly (downwardly) in the longitudinal direction Y more than the joining region 92. The base sheet 70 forming the band-shaped domain 23 extends downward from the joint domain 92, and the extended lower portion can function as a barrier to prevent the excretion flowing into the pocket space S from moving toward the body side.

<Modification 3>

FIG. 12 is an example of a modification of the diaper 10 of the present embodiment, and is a view similar to FIG. 3.

Referring to FIG. 12, in this modification, the liquid-impermeable sheet 94 is arranged in the band-shaped region 23. The sheet 94 is fixed between the inner and outer sheets 76 and 77 forming the base sheet 70. By arranging the liquid-impermeable sheet 94 in the band-shaped region 23, it is possible to effectively prevent the excrement that has moved into the back waist opening side from flowing out to the outside without flowing into the pocket space S.

<Modification 4>

FIG. 13 is a diagram showing a modification of the diaper 10 of the present embodiment. For example, it is the same as FIG. 8.

Referring to FIG. 13, in this modification, the leak-proof sheet 86 extends from the outside region 43 of the pocket to the folded portion 33 and further extends from the folded portion 33 to the inside region 42 of the pocket. If the base sheet 70 is formed of fiber nonwoven fabric only, the soft stool with high fluidity cannot be sufficiently maintained, and there is a possibility that it oozes out. The rear end 86a of the liquid-impermeable leak-proof sheet 86 is located in the pocket 30 Excellent leakage resistance, and can prevent such soft stool from exuding. In addition, the leak-proof sheet 86 has a larger lateral X dimension than the lateral X dimension of the pocket opening of the pocket 30. Therefore, it is possible to effectively prevent the leakage of excrement that enters the pocket space S from the pocket opening.

For each constituent material constituting the diaper 10 of the present invention, unless specifically described, various well-known materials generally used in this kind of field can be used without limitation. In addition, in terms of the basic structure of the diaper 10, in this specification, although the front and rear waist regions 13 and 14 are formed of front and rear waist sheets 17 and 18 of different bodies, the front and rear waist regions 13, 14 and crotch may be used. The structure formed by the continuous thin body of the lower domain 15 may have both side edges of the front and rear waist domains 13 and 14 instead of a pull-on type connected in advance, but these unfolded diapers connected by a buckle. In addition, the terms "1st" to "3rd" used in this specification are used only to distinguish the same elements and positions.

The disclosure of the present invention described above can at least summarize the following matters.

A disposable diaper, which has an up-down direction, a horizontal direction, and a front-back direction intersecting the same when worn, and includes: skin contact surface and The non-skin contact surface on the opposite side, the front waist region, the back waist region, the crotch region between the front and back waist regions, and the absorbent body extending from the crotch region to the front and back waist regions are discarded after use The diaper is characterized in that the rear waist region has a band-shaped region extending laterally on the skin contact surface side, and a pocket forming portion located on the non-skin contact surface side, and A pocket having a central portion in the lateral direction and the band-shaped domain facing the front-rear direction and capable of opening downward is provided, and the pocket-forming section has: two side fixing portions fixed to the band-shaped domain; A pocket inner domain extending upward from a portion connected to the band-shaped domain between the fixing portions; and a pocket outer domain which is opposed to the pocket inner domain in the front-rear direction via the bending portion extending laterally toward the crotch The domain extends and is located on the extension line of the absorbent body, and the pocket elastic body extending in the lateral direction is arranged in the pocket inner domain, and the pocket outer domain is an extension line having edges positioned on both sides of the absorbent body The position of the aforementioned laterally bent portion.

The disposable diaper of the present invention disclosed in the above paragraph 0058 may include at least the following embodiments.

(1) The pocket forming portion has two pocket domains formed by both sides of the inner and outer domains of the pocket, the pocket elastic body is disposed between the two pocket domains, and the pocket elastic body The two sides of the pocket are contracted and bent toward the inner side in the lateral direction.

(2) The pocket elastic body extends in the lateral direction between the two side fixing portions of the pocket forming portion.

(3) The band-shaped domain is elastically stretchable in the lateral direction.

(4) The shrinkage rate in the transverse direction of the band-shaped domain is higher than the shrinkage rate in the transverse direction of the inside and outside domains of the pocket.

(5) In the rear waist region, an induction groove extending from the crotch region to the rear waist region is formed in the absorber.

(6) The belt-shaped domain and the pocket-forming portion are located on the waist opening side of the rear waist domain.

(7) An elastically stretchable sheet is arranged on the skin-facing surface side of a portion of the inside pocket of the belt-shaped domain facing the front-rear direction.

(8) The band-shaped domain has upper and lower ends facing in the vertical direction, and the contraction force of the lower end part is higher than the contraction force of the part other than the lower end part.

(9) It further has a liquid-impermeable sheet extending from the upper end portion of the absorber to the bent portion, and having a size in the lateral direction that is larger than a size in the lateral direction of the opening of the pocket.

45‧‧‧Fixed parts on both sides

23‧‧‧ Ribbon

41‧‧‧The central part of the band

14b‧‧‧The opening edge of the back waist

41b‧‧‧Outer end

21‧‧‧ waist opening

14‧‧‧ Rear waist

10‧‧‧Disposable diapers

31‧‧‧Bending Department

32‧‧‧ Pockets on both sides

49‧‧‧Pocket elastomer

33‧‧‧Bending Department

20‧‧‧Pocket forming department

43‧‧‧Outside pocket

85c‧‧‧Edges

30‧‧‧ Pocket

15‧‧‧Crotch domain

85‧‧‧Absorber

32‧‧‧ Pockets on both sides

41a‧‧‧Inner end

42‧‧‧Pocket inner domain

78‧‧‧Wrinkle

F‧‧‧ direction

Claims (10)

A disposable diaper, which has an up-down direction, a horizontal direction and a front-back direction intersecting the same when worn, and includes: a skin contact surface and a non-skin contact surface on the opposite side, a front waist region, and a back The waist region, the crotch region between the front and rear waist regions, and the disposable diaper of the absorbent body that extends from the crotch region to the front and rear waist regions, is characterized in that the rear waist region has: A band-shaped domain, which is located on the skin contacting surface side and extends in the lateral direction; and a pocket forming portion, which is on the non-skin contacting surface side, and is provided with a central portion in the lateral direction that can face the banded shape A pocket that opens downward in the front-rear direction, and the pocket-forming portion includes: two side fixing portions fixed to the band-shaped domain; and extends upward from a portion connected to the band-shaped domain between the two side fixing portions The inner area of the pocket; and the outer area of the pocket, which extend to the inferior area of the crotch and oppose the inner area of the pocket in the front-rear direction through the bent portion extending laterally, and are located on the extension line of the absorber The pocket inner region is provided with a pocket elastic body extending in the lateral direction, and the pocket outer region is a portion that is bent in the lateral direction and has a position on an extension line of both side edges of the absorbent body. The disposable diaper as described in item 1 of the scope of the patent application, wherein the pocket forming portion has pocket side regions formed by both side portions of the inside and outside domains of the pocket, between the two side domains of the pocket The pocket elastic body is disposed, and by contraction of the pocket elastic body, both side regions of the pocket are bent toward the inner side in the lateral direction. If the application described in item 1 or 2 of the patent scope is abandoned after use In a disposable diaper, the pocket elastic body extends in the lateral direction between the two side fixing portions of the pocket forming portion. The disposable diaper described in item 1 or 2 of the patent application scope, wherein the band-shaped domain is elastically stretchable in the lateral direction. The disposable diaper described in item 4 of the patent application scope, wherein the shrinkage rate in the transverse direction of the band-shaped domain is higher than the shrinkage rate in the transverse direction of the inner and outer domains of the pocket. The disposable diaper as described in item 1 or 2 of the patent application scope, wherein in the rear waist region, an induction groove extending from the crotch region to the rear waist region is formed in the absorber. The disposable diaper as described in item 1 or 2 of the scope of the patent application, wherein the band-shaped domain and the pocket forming portion are located on the waist opening side of the rear waist domain. The disposable diaper as described in item 1 or 2 of the patent application scope, wherein the band-shaped domain and the pocket inner domain are elastically stretchable on the skin-facing surface side of the portion facing the front-back direction Sexual flakes. The disposable diaper as described in item 4 of the patent application scope, wherein the band-shaped domain has upper and lower end portions facing in the up-down direction, and the contraction force of the lower end portion is formed other than the lower end portion. The part has higher contractility. The disposable diaper as described in item 1 or 2 of the patent application scope, which further has an extension from the upper end of the absorbent body The liquid-impermeable sheet that reaches the bent portion and has a larger lateral dimension than the lateral dimension of the opening of the pocket.

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